Three port wall plate insert



FIG. 1 is a front perspective view illustrating a design for a three port wall plate insert;

FIG. 2 is a back perspective thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a right side view; the left side being a mirror image. 

The ornamental design for a three port wall plate insert, as shown and described. 